Would like to have made a rolled firewall, but could only make bends. The frame looks narrow with the engine sitting there. I wanted to get headers, but would the cast iron manifolds be better? The hi-perf ones are pricey, is there a big difference? I looked at a big-block dakota website, and 440's fit with headers, but I have to have the engine sit farther back than stock. Guess I need to find some used cheap headers.